Respiratory distress syndrome is due to
a. a lack of surfactant in the lungs.
b. premature birth.
c. lack of prenatal care.
d. a lack of surfactant in the lungs and premature birth.
e. premature birth and lack of prenatal care.
D
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Refer to the accompanying figure. At what point is there potential to undergo mitosis to become a gametophyte?
a. 2 b. 3 c. 5
d. 6 e. 9
In a hypothetical situation, the genes for sex pilus construction and for tetracycline resistance are located on the same plasmid within a particular bacterium
If this bacterium readily performs conjugation involving a copy of this plasmid, then the result should be the _____. A) temporary possession by this bacterium of a completely diploid genome B) rapid spread of tetracycline resistance to other bacteria in that habitat C) subsequent loss of tetracycline resistance from this bacterium D) production of endospores among the bacterium's progeny
If in male fruit flies, crossing-over does not occur during meiosis, while in females crossing-over does occur
A. there is less genetic variety among sperm than among eggs. B. fewer sperm are produced than eggs. C. males are not necessary for fertilization in fruit flies. D. more female offspring will be produced than male offspring.
Pathogens spread via airborne transmission are fragile and do not survive for long periods of time outside the body. ?
Indicate whether the statement is true or false